After a discussion on a German a website, NVIDIA confirmed that the Geforce 600 series does not fully support DirectX 11.1 aka is 100% compatible. Well, it doesn't fully support the API. The GTX 680 supports DirectX 11.1 with hardware API eature level 11.0, including all optional features.

Now that does include a number of features useful for game developers such as ...

And here I was still wondering what DX 11.1 features my 580 would support since no one seems to have made an official statement about that yet either. I'm guessing not much, or only as much as the 600s.

No, Some times its good to know you have support of something even if you don't use it (Peace of Mind) but why did they sell the products as fully compliant with DX 11.1? does this mean the 400 and 500 series have the same dx compatibility as the 600 series?

No, Some times its good to know you have support of something even if you don't use it (Peace of Mind) but why did they sell the products as fully compliant with DX 11.1? does this mean the 400 and 500 series have the same dx compatibility as the 600 series?

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Your OP already answers your question..........

"NVIDIA does support 11.1 features with 11_0 feature level through the DirectX 11.1 API"

So unless 11.1 API was around when the 4 and 5 series were origionally released, the 6 series gives you a "little" more

There are some really nice features in DX 11.1
For instance, the ability to handle video resources in shaders.
What makes the incremental updates to DX useless is that the developers do not want to expend the resources (ie. time and money) to recode their existing engines to utilize the new APIs. If the developers aren't using it, the card manufacturers have little reason to bake it into the hardware.
This is not a failing of DX, but rather a stalled implementation of it's features due to hardware constraints across all of the platforms for which a developer has to write their code.
It makes no sense to expend the resources to develop for a 1% user base.

Well, As for now, we can count easy the game that are dx11 xD The list isn't that big..

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Exactly.

If and when DX 11.1 is relevant it will be supported by all mainstream cards.
MS is to busy fumbling Windows 8 phone and pc to bother with DX 11.1, if they do something dumb like DX 11.1 Win8 exclusive I have a feeling most devs will just pass on 11.1 just like 10.1 .

There are some really nice features in DX 11.1
For instance, the ability to handle video resources in shaders.What makes the incremental updates to DX useless is that the developers do not want to expend the resources (ie. time and money) to recode their existing engines to utilize the new APIs. If the developers aren't using it, the card manufacturers have little reason to bake it into the hardware.
This is not a failing of DX, but rather a stalled implementation of it's features due to hardware constraints across all of the platforms for which a developer has to write their code.
It makes no sense to expend the resources to develop for a 1% user base.

That's why MS is trying to release new major DX releases together with OS releases. A bit to make it artificially look more appealing to users and to also make significant jumps together with the OS. Its the point where most users will make massive upgrades and it somehow actually makes sense.

Though, they could just as well make big DX updates like we got them with earlier DX releases (DX5, 6,7,8,9 etc). It worked just fine back then. It's just that these days developers fiddle and waste time on stuff that in the end makes no effect or is in fact the opposite of what it was designed for. For example the overrated and wrongly used tessellation. They all used it wrong and as a result we got crappy running games that didn't look any better opposed to blazing fast games that would look the same as all the others without tessellation. And there are many similar examples. They aren't using new features properly, they just use them for the sake of using them. Or they just don't even bother at all.

No, Some times its good to know you have support of something even if you don't use it (Peace of Mind) but why did they sell the products as fully compliant with DX 11.1? does this mean the 400 and 500 series have the same dx compatibility as the 600 series?